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A-level Chemistry Definitions Questions and Answers
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January 2026

2025/2026

A+
A-level Chemistry Definitions Questions and Answers isotopes atoms of the same element with different numbers of neutrons atomic (proton) number the number of protons in the nucleus of an atom mass (nucleon) number the number of particles (protons and neutrons) in the nucleus ion a positively or negatively charged atom or (covalently bonded) group of atoms (molecular ion) relative isotopic mass the mass of an atom of an isotope compared with one twelfth of the m...
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